Abstr: five key points: pay attention to the power supply, the length of the signal line, the quality of the speaker cable, the grounding of the equipment, the reverse phase and short circuit of the signal
1. Pay attention to power supply: audio equipment should have special power supply and standard voltage, which should be separated from the power supply of lighting. With the special power supply, there should be a stable and reliable power socket. The "Power Sequencer" can be used as much as possible. Although the cost is increased, the stability and ease of use are improved. In a word: it is very important to connect the power supply of all audio equipment correctly and reliably. There is another point to note: some imported equipment power supply will have 110V and 220V selection switch. In China, it must be confirmed that the selection is in the position of 220V before connecting and energizing.
2. Pay attention to the length of the signal line: when connecting the equipment, try to use a shorter signal line to save cost and reduce line resistance and interference. Under normal conditions, the longest signal line with balanced transmission mode can reach about 300 meters, while non balanced transmission line can not be used for long-distance transmission. The signal line of power amplifier should use balance line as much as possible. If there are multiple power amplifiers in the system, it is better to use the signal amplification distributor to separate out enough signal lines without attenuation for each power amplifier to be used separately. This can reduce system noise, reduce hidden dangers and improve signal-to-noise ratio.
3. The quality of speaker cable: try to use thick and short copper special speaker cable. When connecting, you must also pay attention to distinguish positive and negative poles and avoid short circuit, especially for professional four core or above speaker plug, several wiring posts inside are very small, so we must pay attention to wiring.
4. Pay attention to the grounding of the equipment: it is very important to correctly connect the ground wire to all audio equipment. Good grounding can reduce the interference of signal transmission and improve the stability of the equipment. It should be noted that the grounding wire should be done according to the grounding standard of the lightning conductor, that is, the conductor buried in the underground part should be rustproof, well contacted, and buried deeply. It should not be shared with the grounding wire of three-phase power line, which will not reduce the noise in the sound system, but also easily damage the equipment.
5. Pay attention to the reverse phase and short circuit of the signal: the short circuit of the signal line often causes silent fault, but it is very troublesome to check it. Unless one signal line is removed and tested with a multimeter, special care should be taken when welding the line.
